sensors Mode-S transponder
405BFD
ICAO 24-bit transponder address · allocated to United Kingdom
Currently assigned to G-YMMT · BOEING 777-200
- Hex
- 405BFD
- Octal
- 20055775
- Decimal
- 4,217,853
- Country
- GB
- Tail
- G-YMMT
- Type
- B772
- Flights observed
- 199
- Distinct callsigns
- 20
- Country
- GB
- Last broadcast
- 3h ago
Last known position
Country allocation
The ICAO 24-bit address 405BFD falls within the block assigned to United Kingdom (GB) by ICAO Annex 10, Volume III. Every aircraft registered in United Kingdom receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.
Callsign history 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| BAW249 | - | 18 | 2026-07-13 |
| BAW248 | - | 16 | 2026-07-13 |
| BAW142 | British Airways | 16 | 2026-05-09 |
| BAW143 | British Airways | 14 | 2026-05-09 |
| BAW118 | British Airways | 11 | 2026-05-28 |
| BAW134 | British Airways | 9 | 2026-05-19 |
| BAW5VY | British Airways | 8 | 2026-05-31 |
| BAW119 | British Airways | 8 | 2026-05-27 |
| BAW88C | British Airways | 6 | 2026-06-01 |
| BAW265 | - | 6 | 2026-06-19 |
| BAW264 | - | 6 | 2026-06-20 |
| BAW46EZ | - | 5 | 2026-07-12 |
| BAW461 | - | 5 | 2026-07-12 |
| BAW63H | - | 4 | 2026-07-09 |
| BAW43C | - | 4 | 2026-07-04 |
| BAW21V | - | 4 | 2026-06-15 |
| BAW181 | British Airways | 4 | 2026-04-14 |
| BAW120 | - | 4 | 2026-06-16 |
| BAW51B | British Airways | 3 | 2026-04-27 |
| BAW50G | British Airways | 3 | 2026-04-26 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-13 | BAW248 | - | Jul 13, 20:10 UTC | Jul 13, 23:00 UTC | 2h 50m |
| 2026-07-13 | BAW248 | - | Jul 13, 15:40 UTC | Jul 13, 18:00 UTC | 2h 20m |
| 2026-07-13 | BAW249 | - | Jul 13, 10:45 UTC | Jul 13, 13:45 UTC | 3h 0m |
| 2026-07-12 | BAW249 | LHR → GIG | Jul 12, 21:10 UTC | Jul 13, 08:05 UTC | 10h 55m |
| 2026-07-12 | BAW461 | MAD → LHR | Jul 12, 15:50 UTC | Jul 12, 17:45 UTC | 1h 55m |
| 2026-07-12 | BAW46EZ | LHR → MAD | Jul 12, 12:01 UTC | Jul 12, 13:50 UTC | 1h 50m |
| 2026-07-11 | BAW248 | - | Jul 11, 20:05 UTC | Jul 12, 06:45 UTC | 10h 40m |
| 2026-07-11 | BAW248 | - | Jul 11, 15:30 UTC | Jul 11, 17:55 UTC | 2h 25m |
| 2026-07-11 | BAW249 | GIG → EZE | Jul 11, 10:30 UTC | Jul 11, 13:35 UTC | 3h 5m |
| 2026-07-11 | BAW249 | - | Jul 11, 08:10 UTC | Jul 11, 08:20 UTC | 10m |
| 2026-07-10 | BAW249 | - | Jul 10, 21:20 UTC | Jul 11, 07:15 UTC | 9h 55m |
| 2026-07-10 | BAW461 | - | Jul 10, 15:50 UTC | Jul 10, 17:35 UTC | 1h 45m |
| 2026-07-10 | BAW46EZ | LHR → MAD | Jul 10, 12:10 UTC | Jul 10, 14:00 UTC | 1h 50m |
| 2026-07-10 | BAW9159 | LGW → LHR | Jul 10, 09:45 UTC | Jul 10, 10:10 UTC | 25m |
| 2026-07-09 | BAW63H | MCO → LGW | Jul 9, 21:25 UTC | Jul 10, 05:15 UTC | 7h 50m |
| 2026-07-09 | BAW2035 | LGW → MCO | Jul 9, 10:05 UTC | Jul 9, 18:50 UTC | 8h 45m |
| 2026-07-08 | BAW2160 | LGW → LGW | Jul 8, 10:55 UTC | Jul 9, 04:25 UTC | 17h 30m |
| 2026-07-07 | BAW2238 | - | Jul 7, 21:20 UTC | Jul 8, 05:20 UTC | 8h 0m |
| 2026-07-07 | BAW2239 | - | Jul 7, 10:20 UTC | Jul 7, 18:20 UTC | 8h 0m |
| 2026-07-06 | BAW2160 | LGW → LGW | Jul 6, 09:50 UTC | Jul 7, 04:00 UTC | 18h 10m |
| 2026-07-05 | BAW2238 | - | Jul 5, 20:35 UTC | Jul 6, 04:40 UTC | 8h 5m |
| 2026-07-05 | BAW2239 | - | Jul 5, 09:50 UTC | Jul 5, 17:55 UTC | 8h 5m |
| 2026-07-04 | BAW63H | MCO → LGW | Jul 4, 22:15 UTC | Jul 5, 06:15 UTC | 8h 0m |
| 2026-07-04 | BAW43C | LGW → MCO | Jul 4, 10:20 UTC | Jul 4, 19:00 UTC | 8h 40m |
| 2026-07-03 | BAW2160 | LGW → LGW | Jul 3, 10:20 UTC | Jul 4, 04:00 UTC | 17h 40m |
| 2026-07-02 | BAW2156 | LGW → LGW | Jul 2, 12:00 UTC | Jul 3, 05:25 UTC | 17h 25m |
| 2026-07-02 | BAW12TB | TPA → LGW | Jul 2, 01:00 UTC | Jul 2, 09:00 UTC | 8h 0m |
| 2026-07-01 | BAW12J | LGW → TPA | Jul 1, 13:35 UTC | Jul 1, 22:35 UTC | 9h 0m |
| 2026-07-01 | BAW63H | MCO → LGW | Jul 1, 01:50 UTC | Jul 1, 09:55 UTC | 8h 5m |
| 2026-06-30 | BAW43C | - | Jun 30, 21:35 UTC | Jun 30, 22:40 UTC | 1h 5m |
| 2026-06-30 | BAW43C | - | Jun 30, 10:00 UTC | Jun 30, 19:50 UTC | 9h 50m |
| 2026-06-29 | BAW17PA | LGW → LGW | Jun 29, 10:10 UTC | Jun 30, 04:20 UTC | 18h 11m |
| 2026-06-28 | BAW17PA | LGW → LGW | Jun 28, 10:19 UTC | Jun 29, 04:04 UTC | 17h 45m |
| 2026-06-27 | BAW63H | MCO → LGW | Jun 27, 23:25 UTC | Jun 28, 06:55 UTC | 7h 30m |
| 2026-06-27 | BAW43C | LGW → MCO | Jun 27, 11:30 UTC | Jun 27, 20:14 UTC | 8h 45m |
| 2026-06-26 | BAW2161 | LGW → LGW | Jun 26, 10:15 UTC | Jun 27, 04:05 UTC | 17h 50m |
| 2026-06-22 | BAW9173 | - | Jun 22, 08:54 UTC | Jun 22, 09:04 UTC | 10m |
| 2026-06-22 | BAW64 | - | Jun 22, 02:40 UTC | Jun 22, 05:04 UTC | 2h 25m |
| 2026-06-21 | BAW65 | - | Jun 21, 09:10 UTC | Jun 21, 13:20 UTC | 4h 10m |
| 2026-06-20 | BAW264 | - | Jun 20, 00:14 UTC | Jun 20, 10:09 UTC | 9h 55m |
| 2026-06-19 | BAW265 | - | Jun 19, 10:59 UTC | Jun 19, 21:39 UTC | 10h 40m |
| 2026-06-18 | BAW248 | - | Jun 18, 20:05 UTC | Jun 19, 06:49 UTC | 10h 44m |
| 2026-06-18 | BAW248 | - | Jun 18, 15:40 UTC | Jun 18, 18:00 UTC | 2h 20m |
| 2026-06-18 | BAW249 | - | Jun 18, 10:25 UTC | Jun 18, 13:30 UTC | 3h 5m |
| 2026-06-17 | BAW249 | - | Jun 17, 21:15 UTC | Jun 18, 08:25 UTC | 11h 10m |
| 2026-06-17 | BAW461 | MAD → LHR | Jun 17, 15:55 UTC | Jun 17, 17:50 UTC | 1h 55m |
| 2026-06-17 | BAW46EZ | - | Jun 17, 11:40 UTC | Jun 17, 13:25 UTC | 1h 45m |
| 2026-06-16 | BAW290 | IAD → LHR | Jun 16, 23:40 UTC | Jun 17, 06:15 UTC | 6h 35m |
| 2026-06-16 | BAW291 | LHR → SFO | Jun 16, 13:30 UTC | Jun 16, 21:00 UTC | 7h 31m |
| 2026-06-16 | BAW120 | - | Jun 16, 02:00 UTC | Jun 16, 09:10 UTC | 7h 10m |
About Mode-S
A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.
Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.
Prefer a tail-number view? See the G-YMMT page for operator, model, and routing details .